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Get this they used R11 or R13 insulation in the walls. The also didn't use a radiant heat barrier on the roof. I told the builder about the loss of cooling capacity in the ducts.

He said .... bunch of bs. He's having ac company come out to "see what they can do" I told him I want a copy of the Manual J load calc. He said they didn't have it that the ac company may. I suspect they never did one. I also explained that it is Texas building code that they do one.

We will see what they say when they come out. I suspect I will most likely get an independent person to do a load calc on the house.

section 3.2.2 design hvac system. loads and cfm calculation states " acca manual j load calculation or equivalent required".
1500 sqft tract homes in cali 3.5 tons a minimum. based on the thousands of tract homes out here. as i said in a previous thread previous home 1711 sqft with a 4 ton. cooling worked fine. who's right or who' wrong?

Is it the standard for HVAC systems to be designed for only 75-78 degrees on a 95 degree day?

If my house couldn't keep the temp. at 70-72 when it's 95+ degrees out, I would not be happy.

The way I look at it, slightly oversized(oversized to others but possibly right sized to me) is like having a car with a V8 engine. You may not need the extra power all the time, but it's there when you want/need it.

oversized is not the answer right size is. oversize will make the house swampy. not comfortable. you have what you have right now. but an airhandler with a variable speed blower and a txv is best. with builders it's the bottom line. that is one of the problems I have found in the new houses.